Trouble, by Kate Christensen, paperback (fair/good condition)
 
Josie is a Manhattan psychotherapist living a comfortable life with her husband and daughter. Raquel is a Los Angeles rock star with a platinum album and the attendant money and fame. When Josie realizes her marriage is over, and Raquel finds herself at the center of a scandal, these old friends take off for Mexico City where sweltering heat, new acquaintances, and tequila-fueled nights rapidly spiral out of control. In this vibrant novel, award-winning author Kate Christensen has crafted a bewitching tale of lust, loyalty, and the limits of friendship.