In "Stepping Up" by Lisa Cullen, readers are presented with an engaging blend of personal drama and professional intrigue, woven together through the lives of three pivotal characters. The novel, set against the backdrop of a bustling Broadway theater, provides an insider's view into the often-glamorous, sometimes gritty world of theatrical production. Cullen's narrative promises to captivate those intrigued by the arts and the complex relationships that fuel them.

At the heart of this novel are the intertwining stories of Jane, Michael, and Elizabeth, each connected through their association with a prestigious Broadway play. Jane, a veteran production manager slowly losing her passion for the stage, confronts her professional insecurities and personal demons. Michael, a young, ambitious director, grapples with the pressures of delivering a successful show under the skeptical eyes of critics. Elizabeth, a seasoned actress contemplating the potentially waning days of her career, must decide how much she's willing to sacrifice for one last leading role. These characters are richly drawn, with their vulnerabilities and motivations painted in careful strokes by Cullen’s expert hand.

One of the book's strongest elements is its exploration of the theme of resilience. Through Jane, Michael, and Elizabeth, Cullen articulates the sense of perseverance that is essential in the world of theater. Each character faces significant challenges—Jane’s emerging feeling of obsolescence, Michael's battle against doubt, and Elizabeth's fear of irrelevance. Cullen skillfully shows readers that it's not the applause at the end of the night that defines a theater professional, but rather the quiet, often unseen resilience to perform night after night, regardless of the personal cost.

The setting of "Stepping Up" is an integral character in its own right. Cullen’s descriptions of the inner workings of a Broadway theater, from the chaotic, whispered frenzies backstage to the rapture of opening nights, are vivid and well researched. The tangible details of the setting help anchor the emotional lives of the characters, offering a striking contrast between the glamor of the stage and the personal toll it exacts from those who dedicate their lives to it.

In delving deep into the personal paths of the characters, Cullen does a commendable job of weaving in significant social commentary. Issues such as gender disparity in theater, the commodification of artistic works, and the fleeting nature of fame are addressed. These issues add depth to the narrative, creating not just a series of personal stories, but a broader commentary on the state of modern theater and, by extension, the cultural industries at large.

Cullen’s narrative pacing is also praiseworthy. The balance between the buildup of personal tensions and the climactic moments of theatrical success or failure is masterfully handled, ensuring that readers are swept along not just by the lives of the characters, but by the ebbs and flows of the theater season itself. Her ability to conclude the storylines in a satisfying yet not overly tidy manner speaks to her sophistication as a storyteller. Each ending offers both closure and an opening, a promise that life in and out of the theater goes on.

One potential criticism, however, might be that at times, the internal monologues and reflections can slow the overall pace. Though these elements are crucial for deep character development, they occasionally stall the narrative's progression and lessen the tension. This is a minor flaw in what is otherwise a well-constructed novel.

Ultimately, "Stepping Up" is a compelling read for anyone interested in a behind-the-scenes look at the world of theater, rendered with authenticity and empathy. Lisa Cullen’s ability to craft complex characters who grapple with the universal themes of ambition, fear, and resilience, within the microcosm of a Broadway show, makes for an absorbing and insightful novel. Readers who step into this world will likely find it hard to step back out, captivated by the characters whose lives illuminate the myriad dramas—both onstage and off—that shape our experiences of art and culture.

In summary, Lisa Cullen's "Stepping Up" is a finely tuned, emotionally resonant narrative that speaks not only to the spirit of theater but to the enduring human struggle for significance and recognition. It's a book that deserves a spot on the reading list of both dedicated theater lovers and those who appreciate stories about personal challenges and triumphs.